Means for securing and protecting stay-bolts



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. J. GOUR. MEANS FOR SECURING AND PROTEUTING STAY BOLTS- No. 576,036.- Patented Jan. 26, 1897.

.Fig. 3 is a detail section showing the stay- UNITED STATES PATENT OFFICE.

JOSEPH OOUR, OF CHICAGO, ILLINOIS.

MEANS FOR SECURING AND PROTECTING STAY-BOLTS.

SPECIFICATION forming part of Letters Patent N 0. 576,036, dated January 26, 1897. Application filed September 16, 1896. Serial No. 606,055. (No model.)

To secure a tight and substantial joint between the stay-bolt and the sheets forming .the walls of the fire-box of steam-boiler furnaces has proven a diflicult matter, owing to the high temperature and the great amplitude of movement due to contraction and expansion when cooling and firing. Various ways have been attempted to obviate and meet this objectionable feature, but a perfectly satisfactory, simple, and eifective means has not been devised, and it is the purpose of this invention to overcome all or nearly all the objections urged against present methods and to prevent the burning out of the stay-bolt joints formed between the stay-bolts and the fire-box walls or boiler-sheets, obviate leaking, and guard against cracking and breaking occasioned by contraction and expansion.

The improvement consists in flaring the stay-bolt opening away from the fire side of the boiler-sheet by depressing the portion of the boiler-sheet immediately surrounding the bolt-opening and securing the inner end of the stay-bolt thereto in the usual way by riveting or upsetting and applying a protectingknob to the inner end of the stay-bolt, all as will appear more fully from the subjoined description.

For a full understanding of the merits and advantages of the invention, reference is to be had to the accompanying drawings and the following description.

The improvement is susceptible of various changes in the form, proportion, and the minor details of construction without departing from the principle or sacrificing any of the advantages thereof, and to a full disclosure of the invention an adaptation thereof is shown in the accompanying drawings, in which Figure 1 is a view of a portion of a boilerfurnace sheet as seen from the fire side. Fig. 2 is a section thereof on the line X X.

bolt and the protecting-knob in position. Fig. 4 is a detail view of the protecting-knob.

Corresponding and like parts are referred to in the following description and indicated in the several views of the drawings by the same reference-characters.

The boiler-furnace sheet 1 is provided with a series of stay-bolt openings 2 in the ordinary way, said openings being threaded to receive the inner ends of the stay-bolts, and the portion of the sheet bordering upon the openings is flared away from the fire side of the sheet by being depressed or swaged, as shown most clearly in Figs. 2 and 3, thereby admitting of the inner end of stay-bolt 3 being removed from the plane of the fire side of the sheet, so as to be protected in a measure from the direct action of the flame and hot gases sweeping along the fire side of the sheet, and which results disastrously and shortens the life of a steam-boiler furnace by burning the stay bolt and causing a leaky joint. Each stay-bolt 3 is placed in position in the ordinary manner, and after being screwed into the bolt-openings 2 its inner end is riveted or upset.

As generally practiced, the stay-bolt openings are in the same plane'with the boilerfurnace sheet, and the riveting or upsetting of the stay-bolts tends to subject the sheet to a high tension, andwhen the said sheet is heated this tension is amplified by expansion and increases the liability to rupture, Whereby a leak results. By flaring the bolt-openings the tension is confined to that portion of the sheet immediately surrounding the boltopenings and which is deflected by the flaring portion, and in a similarmanner the contraction and expansion are confined to the flaring portion surrounding the bolt-openings, thereby relieving the body of the sheet in a great measure of the strain, which is the chief cause of cracking and leaky joints. The ends of the stay-bolts, being removed from theflre side of the sheet, are not so liable to be burned out as when they come flush with the fire side or project from the same.

The joint formed between the stay-bolt and boiler-furnace sheet is guarded by a protector in the shape of a knob 4, and this knob likewise masks the inner end of the stay-bolt ICO and prevents it being subjected to the direct action of the fire. This knob 4 is approximately of seinispherical form, and is of a size to overlap the fiaringportion of the bolt-opening, and its inner face has a concave depression 5 to receive the inner convex end of the stay-bolt and a hollow beveled rim portion 6 to conform to and fit snugly against the flaring portion surrounding the bolt-opening. A dowel 7 or similar fastening is employed to secure the knob to the inner end of the staybolt, said dowel being let into corresponding openings formed in the parts 3 and 4.

Having thus described the-invention, what is claimed as new is 1. In combination, a boiler-furnace sheet provided with stay-bolt openings, flared by being depressed or swaged away from the fire side and a stay-bo1t secured in an opening of the sheet and having its inner end remote from the fire side of the said sheet, substantially as and for the purpose set forth.

2. In combination, a boiler-furnace sheet provided with a stay-bolt opening flared by being depressed or swaged away from the fire side, a stay-bolt secured in said opening and having its end portion upset, a knob snugly fitting the flaring portion immediately surrounding the stay-bolt opening,'and a dowel connecting the knob with the stay-bolt, substantially as set forth.

3. The combination with a boiler-furnace sheet having an opening flared by being depressed or swaged away from the fire side, and a stay-bolt secured in the said flaring opening, of a protector having a concave depression to receive the inner end of the stay-bolt, and a beveled rim portion to fit against the flaring portion of the boiler-furnace sheet surrounding the bolt-opening, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affiXed my signature inthe presence of two witnesses.

JOSEPH COUR. lVitnesses:

MIcHEAL FARRELL, FRANK PERRY. 

